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401 záznamů v Medvik

Článek

Pattern and flash evoked potentials in compressive lesions of the visual pathways

Activitas nervosa superior (Praha). 1988 ; Roč. 30 (č. 4) : S. 300-301.

ISSN 0001-7604
Medvik
Zdroj

Článek online

Fusion and fission in the visual pathways

... As the parallel, dorsal and ventral pathways have different temporal resolution we presume that these ...

Kaposvári, P
Autor Kaposvári, P Department of Physiology, Faculty of Medicine, University of Szeged, Szeged, Hungary
Bognár, A
Autor Bognár, A Department of Physiology, Faculty of Medicine, University of Szeged, Szeged, Hungary
Csibri, P
Autor Csibri, P Department of Physiology, Faculty of Medicine, University of Szeged, Szeged, Hungary
Utassy, G
Autor Utassy, G Department of Physiology, Faculty of Medicine, University of Szeged, Szeged, Hungary
Sáry, Gy
Autor Sáry, Gy Department of Physiology, Faculty of Medicine, University of Szeged, Szeged, Hungary

Physiological research. 2014 ; 63 (5) : 625-635. [pub] 20140605

Physiol. Res. (Print)
ISSN 1802-9973
Medvik
Zdroj

Inconsistent information from different modalities can be delusive for perception. This phenomenon can be observed with simultaneously presented inconsistent numbers of brief flashes and short tones. The conflict of bimodal information is reflected in double flash or fission, and flash fusion illusions, respectively. The temporal resolution of the vision system plays a fundamental role in the development of these illusions. As the parallel, dorsal and ventral pathways have different temporal resolution we presume that these pathways play different roles in the illusions. We used pathway-optimized stimuli to induce the illusions on separately driven visual streams. Our results show that both pathways support the double flash illusion, while the presence of the fusion illusion depends on the activated pathway. The dorsal pathway, which has better temporal resolution, does not support fusion, while the ventral pathway which has worse temporal resolution shows fusion strongly.

Článek

Audio-visual integration through the parallel visual pathways

... which are processed through the dorsal, and others through the ventral visual pathway. ...

Brain research. 2015 ; 1624 (-) : 71-7. [pub] 20150709

Brain Res
ISSN 1872-6240
Medvik
Zdroj

Audio-visual integration has been shown to be present in a wide range of different conditions, some of which are processed through the dorsal, and others through the ventral visual pathway. Whereas neuroimaging studies have revealed integration-related activity in the brain, there has been no imaging study of the possible role of segregated visual streams in audio-visual integration. We set out to determine how the different visual pathways participate in this communication. We investigated how audio-visual integration can be supported through the dorsal and ventral visual pathways during the double flash illusion. Low-contrast and chromatic isoluminant stimuli were used to drive preferably the dorsal and ventral pathways, respectively. In order to identify the anatomical substrates of the audio-visual interaction in the two conditions, the psychophysical results were correlated with the white matter integrity as measured by diffusion tensor imaging.The psychophysiological data revealed a robust double flash illusion in both conditions. A correlation between the psychophysical results and local fractional anisotropy was found in the occipito-parietal white matter in the low-contrast condition, while a similar correlation was found in the infero-temporal white matter in the chromatic isoluminant condition. Our results indicate that both of the parallel visual pathways may play a role in the audio-visual interaction.